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How to turn DSX tremolo into a controlled right-hand ability

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Apologies for the previous thread closure. I am very sorry that my previous Technique Critique was closed due to inactivity on my part. First, I want to express my sincere gratitude to the instructor Joao667 for his incredibly detailed response. That answer really put my mind at ease and helped me make a decision: to stop struggling with USX and fully commit to adapting my playing to the DSX motion. Also, a quick note on the footage: I apologize that I don't currently have the equipment to record in 120fps, so I have to submit 60fps videos for now. If high-speed footage is absolutely necessary for analysis, I can try to record a slow-motion clip using an iPhone 12. I am fairly confident that my current motion is DSX. The reason is that I observe an upstroke start with a downward escape, and my pickslanting is upward. There is also a bit of edge picking involved. The mechanics feel like the arm is driving the wrist. The video titled "Latest DSX Tremolo Progress" shows my current status with tremolo. I would love to hear your suggestions on what might need improvement. Issue 1: Rhythmic Switching Meanwhile, I am eager to improve my control over the DSX motion. One specific goal is to adapt to this motion at both slow and fast tempos. To test this, I attempted a switching exercise between 8th notes and 16th notes (video titled "Switching Between 8th and 16th Notes"). The problem is I can only sustain it for a few bars. It seems that at slower speeds, the pick is more prone to shifting position, which gradually disrupts the tremolo. Is this a normal phenomenon? Is this the right way to practice? Issue 2: String Switching My final question is regarding string switching. I have been trying to get comfortable with DSX string changes at higher speeds, but I frequently encounter "picking crashes" or interruptions. Could you offer some advice on the mechanics? The relevant video is titled "DSX Across All 6 Strings". Once again, thank you for the previous detailed explanation. It gave me tremendous motivation and help. Looking forward to your reply!